Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a815e4c8ce43ab6eba88ba9bd09c0fd05e0a68a1dfe6f72d5dc9dddec77b8920' 
  AND token = 'iwk7xLL4GdwVX6P4aXQnRIeCdrHmrZcK3T7JokNPucM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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