Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55caedeca48e28b91cb7a3def4ce365a525f82711e2c21b2d90e197c877a11ee' 
  AND token = '7fDeVk491td2L89AsL0TacGui/eW1zZociFb4bevHbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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