Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5708a4479a9e3e9eb9a046012ee7ade05569b6573e25217e0464ee0448ee84' 
  AND token = 'lMIY0nxtYwbIYSYVsthYvo9yzKN/2nJTYGtVtlK9iss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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