querySelectorAll does not work

Question

I’m trying to pull some html tags to run my script, but I used querySelector and it didn’t work, below the code. I have several spans of this, I wonder how I solve, use the console and does not appear

<span class="buy">R$5,00<a class="select" data-ordem="3" href="#">Comprar</a></span>

const select = document.querySelectorAll(".select");
console.log(select);