Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0810385387d5cbb0f66e2d30c16eb0bfd32c9856e2cc1f8e6499f80796d20305' 
  AND token = 'sPDj2fguEjlUm7i+jCEp1QnKcUtncaIPfLr6nVqf2Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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