Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a4f26b0c91f5b3dc620265b8e7b049738ef590b92be2f4671ddf009c838bec37' 
  AND token = 'ILRaED7qY+LO0eDOH6Ut6vFhek+vAdAvhgpS+sATxWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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