Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e70c14b44d357aa37c2eda54c42abe1e7c15bc31daacdbdf8a7ea3d27bfe52f' 
  AND token = 'jszQBHTrLD49QUVn7hTYS6/e3PfOhawpDBWNioVb7Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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