Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de874342fd0bf81506113d0bab2909f45690665af51bee5ec270fc1fe02eb7a7' 
  AND token = 'hiSHUgA//KlcO+mNIn9o4FkNdiZDYkMjsih16ZcBYEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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