Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e258fdc104ceb1e0e947ee8019b58e8569421c287643268184afeb8e7f0c80' 
  AND token = 'xS/uNYPhEo7SlEa1c/ve5PCy2AHgEKhMFKa+6KOMLKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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