\begin{tcolorbox}
  \footnotesize
  \texttt{\mkvar{MK20DATA} = menke20.xlsx}\\
  \texttt{\mkvar{MK20MD5}{ }  = 8e4eee64791f351fec58680126d558a0}\\
  \texttt{\mkvar{MK20SIZE} = 1.9MB}\\
  \texttt{\mkvar{MK20URL}{ }  = https://the.full.url/is/too/large/for/here/media-1.xlsx}\\
  \vspace{-3mm}
\end{tcolorbox}