Create RangeControl in gutenberg Block

You are creating the MySelectControl component but it is not being used inside the edit function/component. Include it there and it should appear.

If you want it to appear in the settings sidebar, rather than in the editor, simply wrap the component inside the inspector-controls component (from the package @wordpress/editor):

<InspectorControls>
    <MySelectControl />
</InspectorControls>