Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '467933c919aad9a4c658020e1e5dc006ed38632af36fdceda01be60ac1cf2453' 
  AND token = 'TB+WybzZXr4QJjvtZ2nGood4JQiOQTTRnZhLmcybG94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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