Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6befd459354027a524bd554c3ec530ffba2e1339b4e0f20973b091ee20f0e2bc' 
  AND token = 'TdQRAnPlu11PFgHsrbBGZzMGupbHMzOprJupVpkQUj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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