SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4e23ff482633d5cf67f417c089a4fa3e3176c9294ff1bcb24f0d0c84772ab940' 
  AND token = 'oBqqeqm0W/yHwngl5pSO6XQQPmEI9e2X/zE1i8L1wjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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