Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb36dd2fa85ed77f01e8ab0f55172de1db6ae39da4bb33f2e60495f48f445543' 
  AND token = 'hFTE9FqZmOAtkEWTxT33xyTBcB9HpoxNKh77a1F1Zo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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