Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e53b6bdd86835aa82bbd2392650aabe3691ff922dbb1a7082f7e2c4bcb7e89f' 
  AND token = 'B1OKWI5OmF/3Hijta2AAj/vvwUC5EfqrqdgC/be3rUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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