SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9195bf7eb7771fc1fe3232d88ad96052373bfb6da9a04a2f3993a7c235ea199e' 
  AND token = 'M9BpJ8Ka8zFFrtysb+XL0oPEHzqsZomINkHlgGMmhlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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