To click on the Login button you can use either of the the following line of code :
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LinkText :
driver.find_element_by_link_text("Login").click()
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CssSelector :
driver.find_element_by_css_selector("a.login-btn > span.btn-text").click()
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Getting more granular with the CssSelector you can also use the following line of code :
driver.find_element_by_css_selector("a.login-btn[data-bind='click:loginSection.loginClick'] > span.btn-text").click()
Update :
As you are seeing NoSuchElementException you can check this discussion