Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f65a9721ee0555b4aa71705bb34405e90e038ead566dac0c5c1140dd61cb249' 
  AND token = 'a+OfwPde6niDj+GwtUTME3euGkbP0ArdiuYk00tXtWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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