Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e78a214ea1e008a68bfee90093748e4da530cd586149ebf261e70734dee324c' 
  AND token = 'K/miVJEF+OICjersYRqjJ0LpXmrnYdAzJb7Nu44ceik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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