Below, how should I select the elements that contain the class my_class within the element with id = "my_id"?

Note that the element may also have another class, which I am not selecting for.

<div id = "my_id">
    <span class = "my_class hidden">hi</span>
    <span class = "my_class">hello</span>
</div>

was trying

$("#my_id [class*=my_class ]")
jquery
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