Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f981e5aeffcf36ade660ef1640cb95d0b5f4633a0cbfbff82cf346c782daaf' 
  AND token = 'wXfUxl0HDGnnIGmrHYMJPxoNWokI9i3FsA+RtsMsT/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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