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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cb9c4da32cdac7c18a9fbccd4a8ecabc48b7334b78b14c61f1c13582898f8b82' 
  AND token = '4wI9H+Ht/jZaATD9sDYPMzlMZOxYkhO9ny0I28oj4lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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