Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae420a76d081cbc4c1ac55a9e4a66a9c6256b2db8e765eb25f9afaa2ff182b68' 
  AND token = 'zH3/44XI5WOsiqpyKM8SK4cyHIluHA63qCWrpY0DEo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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