Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e7141275cd312af1415a607c5d6bd45927a5988173653dfccd4a796385935a9' 
  AND token = 'uV82rzkc+IbD5FW7KtORy+kNitkY1CVqjC+WODDix4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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