Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '680512f45535e1921ad340d191c8f6bd18ddad11c95f34e504fd8897cf7aac07' 
  AND token = '7G7j3vQ2WNXIdi9XAmgsP2YeIkydxmOQjKeT/kPvj2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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