Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5c09f417e2ddd7d2ddf62749964e43a8fdf9b35f8e7cec5a7b1b1a4b3352df' 
  AND token = 'nD+Gf7Rh43Mxmn1N+YHgLWq7ylXQmeTFgZGWi338XO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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