Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade4aac1272cf340cad5a24926cfa9a3f12135237430352424c346adcf32f5ee' 
  AND token = 'JQ0f7Tg/PDdEkI8gpjiaH24Fj1VBDZG8LZ7h7Z8yI1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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