Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1549c1e8e50edb9dff1b81f5930770c522812844ac011a800b6e41c7561f735' 
  AND token = 'yMAGhZP6YydgoguV1qxftB0eERomrwxtGtQRZiAHMY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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