Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f48cb0bac1010cc58ea58ac2368ebe01ee749704a39754c0cf90c30f54ff195' 
  AND token = '76kkmSZQWU5CTbUDE3ZCV5FzU0EgTgTZLu8ozuo/kgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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