Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b784715b3a06d21cfc920d3d8bf3056901bab65a6b1ad4c9fd8e5facd5e1533f' 
  AND token = 'QGh3xY/P9gQ0VLsWGhI7prHcLMV8gMFTIL1nAxh8Kos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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