Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '109f358ef9483be49a0901c31a05879aba67d882ff83fc9fbbb4935ac9dccb2e' 
  AND token = 'SXLR+FgtuXLPokI9yO/k3xrymR0J/AOjBg/3WsnCpCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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