Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5981cc6be799f1dbb71dfc0bbbbe8d2716aaa2ea3b0beba96f9e4ea190e17382' 
  AND token = 'GHtLo2sHjj6BvwLTRkf4OnhSZh6rUCNKxNXbyx9XItw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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