Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27eecc5693a2bb615a2327c13636b5907ca28fcb44168e3d0808252c42415f85' 
  AND token = '9BvUy0VOXzieQGzLx6lRe6sAlfb5/kuLh+e3KpyUkhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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