SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4d25d9815be7360f58d927d4ad99dfb0d7a097a52df617454793cd298d187cce' 
  AND token = 'RAyP1ZYlcrk2cvC371MNumpAjVg1QQTpGVAENdhF/Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00124

JSON explain

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