Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775c75c09367885df030a832786c78e5788619e92e08fa75005419e442101b20' 
  AND token = 'T/uubssRoop2nmsBu4CvJVtZxvwbEcYosls9TlFiRJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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