Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7ecc7a14763db96841ae305a53d9f9e4be431f37256a6970a08c7293b247f568' 
  AND token = 'ZwTFvMFbNmR9Ne1lZFLpajDjp++liSwY8Zn3b0ZP6Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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