Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0aac5528f30e08946ca018027e509fb486c314f181561b25c60cf72871050b' 
  AND token = 'bEyqmD3CoEKowUTzwHQ36IWaObYnozGmVSTBOuTynqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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