Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbe1e8bbc40692a311dfd64733773aafe87ded6783bef03fa0f72aaa2c6b069' 
  AND token = 'Loo9fEnOPOylghYfTVdDOu+MnZ6L0zrOaaPQxw+R9Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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