Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c564533f28074fdae2a2427ef2271dafe09fc0b3c2aaaf4ffd2bf98f47b7b457' 
  AND token = 'SJr+4y3Jjxnf0ZI7joXcGVTHS7pRGzgIr222ZdOvQA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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