Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9892a56f8747696e3ee62d659a9042388a7ce73a3c240890ea30f4619586073f' 
  AND token = 'KIj85zKCSIMHM71kYxy8eewjbDJHUyyR3W4i+BVJ8WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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