Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54cddfc9a850ca47c7d6452649481eab45b01250b187f2eb7cd4851d36797f9' 
  AND token = 'duUOku5OS0u3VZKTUCtjVIMYmWrxTqMH5sX7EKd5+6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}