Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239c332a6baa84a7d286375677b483dfc3fc7ee09c97674c11347ba3567372ac' 
  AND token = 'MoVGen7S6Ij4AnAQFlyavRjYNYsGxFgUuMe2EmfgmbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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