Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e793c3d232616a5a82ef9d5ca992e9b367f0d400f8b2c3f1f4f0b4f8c0eaba' 
  AND token = 'DztK7jB14bDyFsgRrADXm/pqeeGJCQB6r9W2p4IgDkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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