Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5967b50b1022d12934c13cb828a263499aaf56bed97c0aab8065fb8d44fddb2e' 
  AND token = 'MLOSCHZ3WlyDzn6R4PrvcWTgFLBzy94vpR1uUTk+HuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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