JSFiddle - React, Tailwind, and code Playground
HTML
<script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
<div class="row" id="load-msgs">
<div class="col-md-10 col-sm-12 col-xs-12 ">
<span class="message-box message-other" data-toggle="tooltip" data-placement="right" title="18:28">
lewpwa </span>
</div>
<div class="col-md-10 col-sm-12 col-xs-12 ">
<span class="message-box message-other" data-toggle="tooltip" data-placement="right" title="18:28">
oppa </span>
</div>
<div class="col-md-10 col-sm-12 col-xs-12 ">
<span class="message-box message-other" data-toggle="tooltip" data-placement="right" title="18:36">
oppa </span>
</div>
<div class="col-md-10 col-sm-12 col-xs-12 ">
<span class="message-box message-other" data-toggle="tooltip" data-placement="right" title="18:36">
oppa </span>
</div></div>
JavaScript
$(document).ready(function(){
console.log( $("#load-msgs div span").last().html())
console.log( $("#load-msgs").last().find('div span').html())
})