Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5da28b186a75caaaf59fdab7bffcf01a4f0f6bc2b218e2fd0fe7045c653b8e' 
  AND token = 'UCmuPqWgx2wcMcrb49ZUGGOkfa256GcSp599otWe5eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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