Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8da1e6bb6d82f98d99c4ff7b18fe10530b5e5783b76f99c12d0a7ed7468c6c1' 
  AND token = 'MylmCCVByxHXD4dGkIH2pPiN6bLLFofR5D7n19luwHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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