Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d5d51d6a537f6c3dd0aa7f1b09ecdff4908b987be4f470dc12b8ef0351770b' 
  AND token = '3kxdfGuiagEyhEVeZRwGM1ce6uP/YgxJp5hS6ZhVxts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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