Optimize token cleanup in deleteExpiredTokens

[coderabbitai[bot]]

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The function iterates over all tokens to delete expired ones. Consider optimizing this process if the map grows large. Consider using a more efficient data structure or scheduling regular cleanup tasks to handle large numbers of tokens.\n\nPR URL: https://github.com/rustymotors/server/pull/2037\nComment URL: https://github.com/rustymotors/server/pull/2037#discussion_r1724152019