SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1297463fef0f854812e8b21edd1e21089828056d7d378a62fe3c31bb18765b96' 
  AND token = '/r32fyULTmaVWG+XFnX8ljMFi3ohJaSLx7eJqvoqkC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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