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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '92707cfb1da81572cf4848b1edbc102d2aeac82dad402a408b43626e742fab6c' 
  AND token = 'lf6efUsIY4OYPxq/IrisPCkjCUh266rqhXQv8yZ1Co0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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