Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c9a09840ee9be5e6da83a573684001a3e7d50a1c6bdec7335b4d8722649306' 
  AND token = 'iCfv+ZSLxF53ev+3NGyLCirKX+E9/6OPb2M5ORy5GFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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