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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8fcc1bba84fb6341057a5ea5842a4da3d470afb1000720e18c8299b7e0bcc622' 
  AND token = 'a1i4vmk/1r7YbAUz0jK5YIJ7inEv9dxaqfVWMuRwkdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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