Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e39c143d12c85571e6dabbbefe025bf441d7809983db71da07898fce1c6de92' 
  AND token = 'Brx2931VWTxCfuEdkIN5DpvRjOoeUfiUz+jBsXJOMkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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