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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a3fbfba7bccd3d38a073a9f799ca47ef799dee6f1acc764209d4735cd1489e6b' 
  AND token = 'aXHMEYucpbYImwaaKvdtVIxxu9EqggZeJ8wtwK2Ylz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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