Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f322a174edbe1df1063eff1f6da9a4e4a11c11e56c9da5a371a321a944baca31' 
  AND token = 'RxvdxsjM5gKW4naNP1/p6Vun4bxCqZBPVsc9nLIZJ+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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