SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1fd3c3470851dbd7abf3cf0d80605519cd65b15066974ed83909ec1ad06bf3f1' 
  AND token = 'VhJVtLVqtSg0KWqo0+NLNuiI/Yu1S/TFGQJJV0+M27I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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