Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b4a4755a73a45f486437a08b63e9f5f25d09dedf5efe54fb06939906979609' 
  AND token = '0yG6lMW2TNlfHnRQCNKNN3xIVzZduzlHOlfR9XliLXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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