Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7fa3ccc01541c4868fa22d8b2e2139d9dfd7ba9c86a4eba01c30650d513e39' 
  AND token = 'Wzo9ZdqwTzzOzWfyLLqLe9EEujaG0sQ2eTMrnSBe/jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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