Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '864c0340998c99f23f1737cc539f8e221c2c241ecf3517591be3dbc5e5e70b52' 
  AND token = '9W43Knc07h3N/EHKMFIPOgljf2/YXqdxsXcWSA6QzsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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