Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e604f87bf33a4700796e81286de6206236d2ac3809a6071389aeaf13d323a4d4' 
  AND token = 'w6jXwTSrX1VebtX/QPeyADg7lpIYw+7RxHR8NStEFL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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