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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '30b566a9c943c20e4057ab0d8850c3af8faf8cc69d74059686444847cef1a91c' 
  AND token = 'TGYOgfSfI6DFmStr7MFsTmjdd7UC4HIwvV40Qb4+A1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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