Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae44e46fa241dcefae344e6e7cfc33df0a56e710a818ebedad31e36b5ced3d29' 
  AND token = 'UFxUq6ldwMWfKxBi+ZgRzHTM0U5IqCrp7zN9yFzMHXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}