Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21a719b6b1d609d8d4a6c5f811c8670cf88acce584ca657a88af006fa5e69c68' 
  AND token = '2GpQkLyKUX/OpCgdqDSS2p2rPK6nRSnLAD2Cx6yDMt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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