Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc9aa56b2915ce0133235213e6bbfe94bdf8e18f10f2b162c2e267469f0ee33' 
  AND token = '6Z1QYgqY1i0lX31rk4V3TXOjXqrfED80D3uwN+AKiUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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