Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5186bf11a2670fea1a919037130544c33425d211199a7888b398bd9270f71a47' 
  AND token = '8hOQCZxGvf7nmbhxURacKhyFFznvKIlNI3RrNKgUsj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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