Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e90f6ca18c8d4e54ce504a8dd0fe01a43fc19b7511d56caf00c4a5320d2eca5' 
  AND token = 'IvGsC8bfDTRiM2JhTEyaTveO/+v+nfZm+Knoxmx4tCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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