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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dc0b4b19e3c9b4b6c6e7629f0eb4805459699da7557bb1dc75bfee493ef3b9ac' 
  AND token = 'TgBW15WOeFSomaocFSBDRIr2fVHVQ95NAL2rP7qvP3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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