Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d386aac37ef59b6b36c45d2f371eb7458601e468d9648ac8fb313561b0a156' 
  AND token = 'QkZMUJd25LtNdCQL0+0EXLDGdbyCKD1nufniPae1mOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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