Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a326629f9ba9b6d0e89eec1030187292256eb7e333b29384e108d6c2cdb05d34' 
  AND token = 'KwUVm16gsgXUoxo/LJX9FLxu3A7TCPgr/sQ6qUSm41k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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