Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f0f7d8c17717dd0a5d91b49abb93a6b17b1b58fca911242a132022e6532416f7' 
  AND token = 'knWq7n6GcCR7liNdW/75NaWZbN+RFhEnuwTQRIaZ7FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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