Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e9493f78e66754f0040c6bc5088d3acf7c96754a8186f86e42d53b5f2c0cad' 
  AND token = '8zf+ZgA5lmyx2KbJ3P+44CzIgXVvTkLHtUxT0SvMLDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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