Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8fcfb6fdfbeb371a48b7c77f7a457aeec8df71cacf96e8ef94cbe098856b20' 
  AND token = 'Wx9Nt94AAFyGWp2PgG8r3ySpfLdA3JTRA68AJ4yZt7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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