Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636af48f896cebe0f4ee5f8e1113aec18afb3415cb972d63e7725ee8db88f85c' 
  AND token = 'akH/WaU2d0DVckklEsUtU/Jzma7PNkzHUDVGUiY7hjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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