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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'beb85ca64ab640ed26675f715277f770b725c349f3dff32a194f9f3e7969eb07' 
  AND token = 'UGEz6TdTtt4sEdSmJTkSMTDGa4fu/mFiXMeFyY8W8Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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