Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc631262451780ed9b42df76f58c3e66d2e52b79e13a32dbf3b6313abb504b9' 
  AND token = 'pMHIrtfs+pPXTGBO3+ISpzbV85UkNW44a+xD1YXY5iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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