Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df447c584d7052a16d305b44d5097fc69f3f6aedd0c5c707990afbcee283bc6' 
  AND token = 'h23SD921yC1jostvCuQWIJ1gHeC5vAAFFj0mgOv8kYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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