Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15dd0df9fe142ec0cbbb54c85437d30ed9ef4fede3f2cd813f7ace0479d2ad2b' 
  AND token = '4dsWO24BvRqnvPVQwbYY6KdJ/8ciJWGOYnf3etqVFvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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