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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7ad53956401978246c35a258c914072bf925502144429cc3f0e4a74087394e98' 
  AND token = '47h3JZTooJ5iXbC7ZWQvpG79B79q9uXk6taKwj6nKOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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