Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab736041be3d4c95a30d194e0ed9faeec9ab80e1ef7b1f220f7ff03105d5c144' 
  AND token = 'xhYKYb+rYe0lgd7MifQ6VAJNOPwS+0nyZNrpCYa4hmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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