Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7b1366c6efa92df5fc3522ac326d92efc3b8f1cb224a433f0d3f6742bbfcba' 
  AND token = 'cUxXt1AeJBUvuiOyNGkH/FqadC491+nWigFrOBPJCVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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