Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1fb5415bf1170ac4ca84b9d9b592fa1f5afe52d2d0cc9a916de912b2a5bb1ee' 
  AND token = '1cQfMm/EEKoz6LnCpel+7kLQXwE+3gZIRgbLXQUDGGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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