Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7736d650b5987f5f5c6e7b24cf06e83ecb4686644039c1884a71d04118e7592a' 
  AND token = 'jS4ZI9RUAGLY7PaojtwzskH4s0E004nuHmECVhDzNNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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