Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4341692d2d5c6277764ed813e86776d127b904e3ec34d4489dc89c08541640' 
  AND token = 'U+HaN0re93ZFjj1iRvnDK+GKTy1wr7LCOuBzg7P5fiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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