Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '627ab7e94787f7b89503563e15b9582b84845963c0d8c30107373fc78a902650' 
  AND token = 'tdkEtm071i04UYaAU0xg93KoT3MO7Vo94j6P7yVTgr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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