Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51bf2797dbd286f1fe56ca35bf166e172a8baaaeeaaa42bbe731d6b40e0ebc1f' 
  AND token = 'hchitTxZVopW/MjDtnkNEZLMsGT6rHaiW/qIkwpCsKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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