Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91a5f4c730376d42e118e243c5be60b24cef14cf81f51bda54cac85c64d10af' 
  AND token = 'dR8XGWjN0pl+yqs3uTuLWLxs7t+B/gL6QNJWFmmPp+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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