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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9ebc25bf42ff126f54dca50e9a8df8dc7bb050a46796f6511a256b84f96c5803' 
  AND token = 'giBl31HaocW22eK9j1aG1J3VCtplbMeH5N0NxTkaGys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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