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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '960c1f43575d419b9fea3df3d7b64f9b79c041f8d9ce8cdc1f52329d5c1930f4' 
  AND token = 'vEy4gT4Zs7r6T2hHv/8zF/tG/cNx2fkhmR0/Mei6IYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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