Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '331aeea7e4a90377cb26f0abf6293647b4f1e09a9b6d966e2d53cc20b9318ac4' 
  AND token = '1HcnVsq2jgIApiS7j5h5tgdacDrPIr3ncVQZT2Mi5dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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