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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '45fefdac1edb1eb9e3f950ec6fcc949e823c3f6678c928030067014a0a8f01b1' 
  AND token = 'ioLkBKlFWqWd5Elq9eRNb6YE49zkooWqxmIyXqjrXJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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