Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e839196faff0fdce6767617eaeff9b248d83328a04e0f67df4d7581e58397c93' 
  AND token = 'J9Nd+tp72/3l93YzExOI3gkVJ6gAU9FdnSa385Xctn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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