Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316dc2101ebd9d4280de1b9373066459a09670a03e73a376cb61e233faf9f841' 
  AND token = 'V5RYNXqCnFBOv3p4Q+POlndVOfRlQRwTb0iXEXjxW4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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