Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ef2239d0afbc85d6de64969911ae0639344f096bce524a9c53c8076cfc4fa4' 
  AND token = 'tvvytyOaq3a9fj7eF+Cd1KxiybBikdVRlHZ/09TpJHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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