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If I understand correctly in the documentation, key_buffer_size is only used for MyISAM tables. The documentation doesn’t explicitly say that its not useful for other DB engines, though, hence the question.
Am I right in my assumption?
Your assumption is correct, it is a MyISAM only parameter.
Having said that, note that the MySQL system tables are MyISAM. Consequently, I’d let it keep its default value (i.e. I’d never set it explicitly to zero).