Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6946ca08a7fe3744d3e47e3b1ba77f7c2fe9935d967954662d3ccf2b24aff4a' 
  AND token = 'DnnMxKGfRotuY/1d6wzNQHi8NAv9cK0QW1EdO6tYxDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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