Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a16e936afe3c279600bdf93e00838dc909b739e04f850ee61d8f58f9cbd9b2' 
  AND token = 'TRVQ9IGUqjhSRaXlgpqQmHT+xh+e2bWA0jgDACy4yBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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