Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'be4ef5b67c7d5dcf3baa26f97a83f12710cc27c4a87914e200e77da7152997ed' 
  AND token = '5IMm8s1hWbs2e520SPsifV1jrJGp3M9Dg0YFh192mQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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