Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef9f0769563cde89473ab6d6eb86442d1bda366d6a8acf2b0ed37905b83d6ac' 
  AND token = 'Oe5BFJKSR+6HdwrDzsEB8P/SKGZ1io3o0mI+WkclQfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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