Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de8ff58c40b47ae9cc7b0cb499dfb0d762a0147bdaa8c149b669f835c648831' 
  AND token = 'mL6bw1zooJPQhyWHmXEc9EzjJSpGBhoepVWcdgvnVe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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