Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79616d99fba79fa1091706ce70e0a9b8b95b9d80f01593d36eae1375f0e15504' 
  AND token = '9lRB4UZvpqg2PvhNsFHvmuh6qYFdWPGTIHxIBT6Qy7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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