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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1e72a4fd737940b82339b59016591d9a16cf2b9e621e7de28df8c89acc27d1d3' 
  AND token = '0lEge+gIrmTOd6yEL4Z5Z6iden7/O/638znnDxAqPqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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