Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7bb0e52f845dceafa96ae2cfaafcc2e0d1556ed4a6e3fcf5717442345254192' 
  AND token = 'DkpqOneIwo8jEcOnVYu8OEzQ04loUqzsLEbAvbpWSAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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