Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e8aa472f96c3e9ca54924568d767fff71173076e85634f3853b1bf06997671' 
  AND token = '5WrjUlVFWL6ic0cMSxPdN8cxwmXgvbGITwlLEiVnRtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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