Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc65a6d0bf0a03e1ab688f21597c424aaa17453b57b29fdbd83b155d04324dbe' 
  AND token = 'IVdhCbcjHQXFdkh1nb4fjlWp2YFSiG83Xp8HbZoOJBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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