Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '457828a5c77cb1a40c7e17647fc1e1502bbcaab47d335f09522bbe5653203fcc' 
  AND token = 'fl8S+R+hCs54JPCcedY93pGOC66dWaQFajqmizhRteU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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