You should be very careful about naming tables and columns as you may face a lot of problems in the future.

I recommend finding names that are not MySQL reserved words.

If you still want to keep these names, you should surround them with backticks.

mysql> CREATE TABLE keys (id INT(10), key VARCHAR(100));
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'keys (id INT(10), key VARCHAR(100))' at line 1

mysql> CREATE TABLE `keys` (id INT(10), `key` VARCHAR(100));
Query OK, 0 rows affected, 1 warning (0.97 sec)

mysql> show create table keys;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'keys' at line 1
mysql>
mysql>
mysql> show create table `keys`;
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                        |
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------+
| keys  | CREATE TABLE `keys` (
  `id` int DEFAULT NULL,
  `key` varchar(100) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci |
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)

Please note that backticks must be used when using tables

So the table name keys and field key are reserved in the Mysql namespace. If you choose a different table name (e.g. keys_tbl) and rename the second field to key_id, your code will work correctly.