Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e754e1419564c7aae507e7a00d5dcc3b995a5200b42517a256be9142b58299' 
  AND token = 'jflogursQsdQqflqMHFvldOUJbmD7u2PDBL1zIwhjfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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