Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c39a1a5e8787628243cfac7c7d433e25de30520a83c4b9293d867dc64b04136' 
  AND token = 'ZRjxo1pymPGn8nNNxv31dfBXmbdjYkxsy0F0gUblM6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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