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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2e0cb4c293077a60a454f860aca38c959a43287eaaba2d3ba43bb3c174287eba' 
  AND token = 'LdsCT2o194jEi9kKmvc5NnNzHxqQVtWi+aN6PZZ5TN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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