You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
spl-token was reported malicious
OSV:MAL-2024-10167 - Malicious code in spl-token (PyPI)

spl-token

This package was deleted from PyPI around 2024-03-30. Installing fails with:
$ pip3 install spl-token ERROR: Could not find a version that satisfies the requirement spl-token (from versions: none) ERROR: No matching distribution found for spl-token

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2024-03-29/ \ spl-token
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Or, download files manually

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0.1.1
0.1.2
0.1.3
0.1.4
0.1.5