Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79775603ff7015f10f9a70af6718eef0a3f8b097eec8953fbfb4ee4cbbdf4af' 
  AND token = 'R4fdzBDRLOwTQdeGoXy7i00Kn0FhesVKDpHKn+flFuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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