Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5390b6f57cfc353ca0061b02a3c5954600904bee717912af2019211f8ad23a28' 
  AND token = 'Izm0cn4we+X5KI/Ye2cSfeddwVODbjERSqbJSPn5BHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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