Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '382b0a69a751fc086a9cebf071aa54ee6838998a168c93f02bd664eeb2875fcd' 
  AND token = 'GPBt2rAptJ8YOBXM1+MXsSSAXfPh9WlMi2cMRSG+Qkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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