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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '05e8d1e098a0f5a746a786c4be65866d110406d5f6ca0d9657d7129ba3873709' 
  AND token = 'JKna4TKZqlshPxRbsxfKHA202bDxGMhUKhNAaWlnuVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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