Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '57c157d171145ac7ce8dfd95ea5065cc23d676e9059414240bbec9564b709254' 
  AND token = 'tMaPGMCAGchERrQlewiRRudRofkhCY5vTYbRb20VBgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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