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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ee7efcfa43f671893b78c3c2727f2d3487ca66d295a4556af0ecb3772bbaab72' 
  AND token = '613cWqWCa7/vvNZhCv3JusTBYvlL57S+SlrAg5oW5hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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