Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c82aca71694322060c9bd36a8daba477736fa16cac132b8d6406dfe67c2c54c' 
  AND token = 'ZiaZu/rVnWvWwEM9WZhL2/RKs1TKFzuSs/WAdWXLWg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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