Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ef9c205766e4d96a77d0c49af3165e27090674660a37f390f339ee4fed8338d' 
  AND token = '3kBh2IupnGe4xlgBe7BpsZWsVS96E8gIZeO2W+328Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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