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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0d1d80d09129cfa0ebaf32d7c777af65c387864bbee04ecdc521695dbc1ae684' 
  AND token = 'fmfOi2Fv2IOFtX0QBvED1xAyEvBmxkGVd9IeH4j0IfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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