Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '477341e9c57ec9a835d0384de62af724fc56da6f6e2dcaeb356fee02463a6feb' 
  AND token = 'G2VoHxTHQrIL+Gmfo5Xe6Q1y87DzJO8tIFjsqr7E+AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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