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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cb9a68a110620855be86be439304a3617d40049596dbd74cb0775548ad211261' 
  AND token = 'uwaK2A9MF7Myq67SXfTPX/S47RODXruMtRbjmCC7D0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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