Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0f8ef14b332551db4613dd1b9c54df739a6e182990f8516d8bcec332b914c2' 
  AND token = 'kd8wsCPfle//aJ4PecU630alM22UHh5iHwy/vKm6TM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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