Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c0f5eae9eb51444b6bf4e17b2a82819e7af08c2b9830d4c45a590e6c934818' 
  AND token = 'Nu9QnQc4lOsNrQ2+i3lPOLl0taGVsawt8QWz0NbJJFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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