Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6f730baa90e48e16ba82729718eb5df86d2b667808e6193a816ebf5de8fbf0' 
  AND token = '/zq2YbyNIMtZXSKdf9yq0oQe1urZuWpFV5YKv8nUn9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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