Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d56ad65864d435b08e33c9924ee3280953c846ef0c415250ec32ee2ed7e402' 
  AND token = 'JMYwPcCaZlrwy8pEWIUgIpbK2sDAfVx/SREyQS/yA5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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