Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cffe509a24b559d326a02ed50550778539c77519509be9bf2faab38a3699d23' 
  AND token = 'ruKnA9XxJS7+Zm+NvAiBwVSipK7LabiV46lzuT/+Byo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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