Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a993f302573bb211a5462b96ad94d28b8b4e8909ec4692a8c1664be5818b9e' 
  AND token = 'Y+ccsxYJqXCbnGITShoYtH7IR6PE0hP/6xX/OBW5eqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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