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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd85aba40b7674b124eb692d178b0dea6e5291bab5fc95e029808c303acaa49dd' 
  AND token = 'jK0ixcyeHtChsAw42qvbxLFu+qki7y77TGWjcSSViI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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