Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc8c137e5b8361f3a493f66d4271fee511afee2cf63d364510cf122857801ca' 
  AND token = 'QQOxNKjiRO0rK1xzyr3wO/iZLmxXyoXoXDMwkKLacKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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