Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8a4a4df32134ad771193831ab1ab02f250e8c3f40ff247b2bb9e9a8571397d' 
  AND token = 'VQRUhBN/FDOrCfl8qhdMoBhAk7DkP2T+Wco3zuJX+kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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