Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f659a70027753f6347f1aab79477f2100625497c2e2585a252c02b9cfa3727' 
  AND token = '4nUqUmyN61IOTTpbrVvIpcwUtS1TVF5+qUelRhXSRmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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