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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a32556a43ef1fd4497e3995b640c5d19e43c35f4a458fa810110b03a4e762827' 
  AND token = 'qp9n/EvqtrQ36bJhEcahA1Ic4Aq/DD/xTJiS1iHvIgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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