To find a link based on just its href using capybara you could do
link = page.find(:css, 'a[href="actual link"]')
or if you’re looking to assert that the element exists
page.assert_selector(:css, 'a[href="actual link"]')
or – if using RSpec
expect(page).to have_selector(:css, 'a[href="actual link"]')
Since have link by default searches for substrings in the link text you can also do
expect(page).to have_link(nil, href: 'actual link')
or
page.assert_selector(:link, nil, href: 'actual link')