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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '758b51e239977e42dd4f86288b0379fd9cecf6b62b68aadf6cfdbeba64a9e68d' 
  AND token = 'GvukU+kKNyXd9zQtQ6FihSLMAjxXM6pT4/9W5P8wfWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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